I believe Donald Whytes' source for Rory McLeod and Catherine McCuaig was page 450 of the newer McLeod Book (1793-1993) (MB). I don't know the author or contributor of this genealogy but I doubt its accuracy.
Donald Whyte started compiling his books in 1961 and published in 1972. Did your MB book predate Donald's?
I knew from the MB that the other Roderick McLeod had settled on Lot 30.7 but did not know he married Mary McLeod and had 6 children. Does this genealogy appear in the MB? Was one of their sons Roderick Òg? You say they moved to 24.6 which is close to 22W.6 where Clarence Xavier says Roderick Òg and Catherine McCuaig lived. By 1851 Lot 24.6 was occupied by McPhees.
I do not have the MB book so do not know about this genealogy? Also I do not have any MacLeods in my data base.
I hope you can provide more details or a source for Roderick and Mary and their 6 children.
The source I have is also Donald Whyte's book but I think I have seen his tree on line a while ago.
8467 MacLeod, Roderick Roy. From Glenelg, INV to Lochiel Twp,Glengarry Co. ONT. 1796; stld Lot 30, Con 7, later Lot 24, Con 6. Farmer. m Mary MacLeod qv, and had, with other ch: 1. Donald, qv, 2. Harriet; 3. Malcolm; 4. Catherine; 5. John; 6. Kenneth; 7. Norman